US6496519B1 - Frame based data transmission over synchronous digital hierarchy network - Google Patents
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- US6496519B1 US6496519B1 US09/143,466 US14346698A US6496519B1 US 6496519 B1 US6496519 B1 US 6496519B1 US 14346698 A US14346698 A US 14346698A US 6496519 B1 US6496519 B1 US 6496519B1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/16—Time-division multiplex systems in which the time allocation to individual channels within a transmission cycle is variable, e.g. to accommodate varying complexity of signals, to vary number of channels transmitted
- H04J3/1605—Fixed allocated frame structures
- H04J3/1611—Synchronous digital hierarchy [SDH] or SONET
- H04J3/1617—Synchronous digital hierarchy [SDH] or SONET carrying packets or ATM cells
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing
- H04Q11/0428—Integrated services digital network, i.e. systems for transmission of different types of digitised signals, e.g. speech, data, telecentral, television signals
- H04Q11/0478—Provisions for broadband connections
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J2203/00—Aspects of optical multiplex systems other than those covered by H04J14/05 and H04J14/07
- H04J2203/0001—Provisions for broadband connections in integrated services digital network using frames of the Optical Transport Network [OTN] or using synchronous transfer mode [STM], e.g. SONET, SDH
- H04J2203/0028—Local loop
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J2203/00—Aspects of optical multiplex systems other than those covered by H04J14/05 and H04J14/07
- H04J2203/0001—Provisions for broadband connections in integrated services digital network using frames of the Optical Transport Network [OTN] or using synchronous transfer mode [STM], e.g. SONET, SDH
- H04J2203/0073—Services, e.g. multimedia, GOS, QOS
- H04J2203/0082—Interaction of SDH with non-ATM protocols
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J2203/00—Aspects of optical multiplex systems other than those covered by H04J14/05 and H04J14/07
- H04J2203/0001—Provisions for broadband connections in integrated services digital network using frames of the Optical Transport Network [OTN] or using synchronous transfer mode [STM], e.g. SONET, SDH
- H04J2203/0073—Services, e.g. multimedia, GOS, QOS
- H04J2203/0082—Interaction of SDH with non-ATM protocols
- H04J2203/0085—Support of Ethernet
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J2203/00—Aspects of optical multiplex systems other than those covered by H04J14/05 and H04J14/07
- H04J2203/0001—Provisions for broadband connections in integrated services digital network using frames of the Optical Transport Network [OTN] or using synchronous transfer mode [STM], e.g. SONET, SDH
- H04J2203/0089—Multiplexing, e.g. coding, scrambling, SONET
- H04J2203/0096—Serial Concatenation
Definitions
- the present invention relates to the carrying of data frame traffic over a synchronous digital network.
- Datacoms may operate over a local area, to form a local area network (LAN) or over a wide area to form a wide area network (WAN).
- LAN local area network
- WAN wide area network
- a LAN may cover communicating computing devices distributed over an area of kilometers or tens of kilometers
- a WAN may encompass communicating computing devices distributed over a wider geographical area, of the order of hundreds of kilometers or greater.
- Conventional local area networks are generally taken to be digital data networks operating at rates in excess of 1 MBits/s over distances of from a few meters up to several kilometers.
- Conventional local area networks are almost universally serial systems, in which both data and control functions are carried through the same channel or medium.
- Local area networks are primarily data transmission systems intended to link computer devices and associated devices within a restricted geographical area.
- many local area networks include speech transmission as a service.
- a plurality of computer and associated devices linked together in a LAN may range from anything from a full-scale mainframe computing system to small personal computers. Since a local area network is confined to a restricted geographical area, it is possible to employ vastly different transmission methods from those commonly used in telecommunications systems.
- Local area networks are usually specific to a particular organization which owns them and can be completely independent of the constraints imposed by public telephone authorities, the ITU, and other public services. Local area networks are characterized by comprising inexpensive line driving equipment rather than the relatively complex modems needed for public analogue networks. High data transmission rates are achieved by utilizing the advantages of short distance.
- a wide area network operates in general on a greater scale than local area networks.
- a wide area network is generally employed whenever information in electronic form on cables leaves a site, even for short distances.
- Data transmission rates involved are generally between a few hundred and a few thousand bits per second, typically up to 50 kilobits per second.
- the distances involved in a wide area network are from around 1 kilometer to possible thousands of kilometers, and error rates are greater than with local area networks.
- Wide area networks are generally carried over public telecommunications networks.
- Prior art systems for incorporating frame based data over synchronous networks include schemes which contain Ethernet data frames in asynchronous transfer mode (ATM) cells which are then transported in a plesioscynchronous mode and which may then be transported according to ITU-T recommendation G.708 in a synchronous digital hierarchy (SDH) network.
- ATM synchronous transfer mode
- SDH synchronous digital hierarchy
- IMA Inverse multiplexing of ATM
- an ATM circuit is divided and input into a plurality of E1 circuits.
- PDH plesiosynchronous digital hierarchy
- Ethernet frames are included as the payload of the ATM cells, which are then carried via the E1 circuits over a conventional PDH network.
- this prior art scheme has a disadvantage of a high packetization header overhead, which can comprise up to 20% of the SDH payload.
- Ethernet remote bridge Another prior art system aimed at carrying frame based data over synchronous digital networks is the conventional Ethernet remote bridge.
- This system is based on the known PPP protocol, for example, as implemented by the packet on Sonet (POS phy) system of PMC Sierra.
- POS phy packet on Sonet
- PMC Sierra packet on Sonet
- a further prior art scheme uses a plurality of fiber optic repeaters to provide native Ethernet rate connections between a customer premises and a LAN switch.
- this solution dedicates a whole fiber to Ethernet rate, which is an inefficient use of the fiber optic cable resources.
- One object of the present invention is to provide high data rate, high reliability functionality available with conventional local area networks, but over a wide area network transported on a long distance high capacity synchronous digital network.
- Another object of the present invention is to overcome data rate mis-matched between conventional datacoms systems and conventional telecommunications systems in an efficient manner.
- Another object of the present invention is to incorporate frame based data directly into a synchronous digital hierarchy payload, without encapsulation in an ATM cell or other intermediate carrier.
- Another object of the present invention is to incorporate frame based data into a synchronous network without incurring high processing delays, and without incurring a high packetization header overhead.
- a frame based data communications network comprising:
- a plurality of synchronous multiplexers each having a frame based data channel interface and a synchronous digital communications port, and capable of interfacing between a frame based data protocol and a synchronous digital network protocol;
- said plurality of computing devices communicate with each other over a plurality of frame based data channels, said frame based data channels carried over a synchronous digital transport network connecting said plurality of synchronous multiplexers.
- said frame based channel interface interfaces directly between said frame based data protocol and said synchronous digital network protocol without traversing any intermediate protocols.
- said frame based data channel interface comprises: means for mapping a data frame of said frame based data channel to at least one payload of said synchronous network protocol.
- the synchronous digital transport network may comprise a synchronous digital hierarchy (SDH) network in accordance with ITU-T G70.X, an example of which is the synchronous optical network (SONET) in accordance with ITU-T recommendation G.708 and related recommendations.
- SDH synchronous digital hierarchy
- SONET synchronous optical network
- Synchronous multiplexers may comprise add-drop multiplexers, or terminal multiplexers.
- a synchronous digital multiplexer comprising:
- frame based data channels may be entered directly into synchronous digital hierarchy virtual container payloads in an efficient manner.
- said frame based channel interface comprises:
- a frame based data channel switch communicating with said frame based data channel physical port
- a rate adaption means for converting data at a frame based data channel rate into a bitstream of a data rate capable of being carried in at least one virtual container
- a synchronous digital network payload mapper for mapping said bitstream into said at least one virtual container.
- a method of communicating frame based data over a synchronous digital network comprising the steps of:
- said method comprises the steps of:
- the invention includes a method of creating a frame based data channel within a synchronous digital channel comprising the steps of:
- Said step of mapping preferably comprises containing said modified data frame based data into at least one virtual container.
- the invention includes a communications network comprising:
- a plurality of network components capable of transferring data frames of said OSI layer 2 data channel directly into and out of a plurality of payloads of said at least one synchronous digital channel.
- the invention includes a data communications network comprising:
- a plurality of network devices each comprising: an OSI layer 2 frame switching device; a rate adaption device for adapting a data rate between an OSI layer 2 data rate and a synchronous transmission data rate; and a mapping device for mapping data between said OSI layer 2 frame switch and a synchronous digital channel;
- mapping devices communicate over said synchronous digital channel
- said plurality of OSI layer 2 frame switching devices communicate over an layer 2 channel carried on said synchronous digital network.
- Said OSI layer 2 channel may comprise a ring channel linking said plurality of network devices.
- Said OSI layer 2 channel may comprise a plurality of point to point channels linking pairs of individual said OSI layer 2 frame switches.
- the invention includes a communications network comprising:
- a plurality of network devices each comprising: a rate adaption device for adapting a data rate between an OSI layer 2 data rate and a synchronous transmission data rate; and a mapping device for mapping data between an OSI layer 2 channel and a synchronous digital channel;
- mapping means communicate over said synchronous digital channel
- said plurality of rate adaption means communicate over said OSI layer 2 channel carried on said synchronous digital channel.
- Said OSI layer 2 channel may comprise a ring channel.
- FIG. 1 illustrates schematically elements of a first embodiment data network carrying a frame based data channel over a synchronous data channel;
- FIG. 2 illustrates schematically a frame based data channel port component of a synchronous digital multiplexer according to a first embodiment of the present invention
- FIG. 3 illustrates schematically a prior art synchronous digital hierarchy multiplexing structure
- FIG. 4 illustrates schematically a synchronous digital hierachy; STM frame and payload;
- FIG. 5 illustrates schematically a plurality of synchronous digital multiplexers connected together by means of a plurality of frame based data ports, supporting an Ethernet tandem switching mode channel carried on a synchronous digital loop;
- FIG. 6 herein illustrates a plurality of synchronous digital multiplexers, each having a frame based data port, supporting an Ethernet ring carried on an underlying synchronous digital loop;
- FIG. 7 illustrates schematically a logical view of the Ethernet ring and synchronous digital loop of FIG. 6;
- FIG. 8 illustrates schematically a plurality of synchronous digital multiplexers each having a frame based data port, supporting a plurality of point to point Ethernet channels in a backhaul mode of connection, carried over a synchronous digital loop;
- FIG. 9 herein illustrates a first example of a deployment of a frame based data channel over a synchronous digital hierarchy network
- FIG. 10 illustrates schematically a second example of deployment of frame based data channels over a synchronous digital hierarchy network
- FIG. 11 illustrates schematically a third example of deployment of a plurality of frame based data channels over a synchronous digital hierarchy network.
- FIG. 1 there is illustrated schematically elements of a first embodiment data network according to the present invention.
- a frame based data communications system carried over a synchronous digital network is provided by the arrangement shown in FIG. 1 .
- the terms synchronous network and synchronous digital network are used to refer to a time division multiplexed synchronous transport layer in OSI layer 1 .
- Conventional examples of such networks include the synchronous digital hierarchy (SDH) of ITU-T recommendation G70.X, which incorporates synchronous optical network (SONET) systems specified in ITU-T recommendation G.709 and related recommendations.
- SDH synchronous digital hierarchy
- ITU-T recommendation G70.X which incorporates synchronous optical network (SONET) systems specified in ITU-T recommendation G.709 and related recommendations.
- SONET synchronous optical network
- the data network elements comprise first and second synchronous digital terminal multiplexers, 100 , 101 connected to each other by an optical fiber communications link 102 ; a first datacoms router 103 communicating with first terminal multiplexer 100 ; a second datacoms router 104 communicating with second terminal multiplexer 101 ; a first computer device 105 communicating with first datacoms router 100 ; and a second computer device communicating with second datacoms router 104 .
- Each of first and second computer devices 105 , 106 , first and second routers 103 , 104 and first and second terminal multiplexers 100 , 101 comprise a frame based data channel interface.
- First and second computer devices communicate frame based data with each other over the routers and over the optical fiber communications link.
- Communication between first and second multiplexers 100 , 101 is via a synchronous digital network protocol, for example the synchronous digital hierarchy protocol (SDH) or synchronous optical network protocol (SONET) as specified in ITU-T recommendation G.709 and related recommendations.
- a synchronous digital network protocol for example the synchronous digital hierarchy protocol (SDH) or synchronous optical network protocol (SONET) as specified in ITU-T recommendation G.709 and related recommendations.
- Communication between the computing devices 105 and 106 and the respective datacoms routers 103 , 104 is by conventional data frame based data communications protocol.
- frame based data communications protocol or system is used to refer to any data communications system or protocol in which blocks of data are assembled within OSI layer 2 . Both traffic data and control data may be contained within the OSI layer 2 frame. Frames in OSI layer 2 systems may comprise packets or blocks of data bytes of variable length. Examples of conventional frame based data communications protocols include IEEE standard 802.3 CSMA/CD local area network systems, Ethernet systems, conventional token ring systems, conventional token bus systems, conventional fiber distributed data interface FDDI systems and conventional dual queue dual bus (DQDB) systems.
- DQDB dual queue dual bus
- first and second routers 103 , 104 Communication between first and second routers 103 , 104 and respective first and second terminal multiplexers 100 , 101 is by a frame based data technology as will be understood by those skilled in the art.
- First and second terminal multiplexers 100 , 101 may be separated geographically by distances from the order of a few meters to thousands of kilometers.
- the arrangement shown in FIG. 1 is a simplified arrangement, and in practice many computer devices, many routers and many multiplexers will be interconnected to form an integrated frame based data communications system carried over a synchronous digital network.
- an Ethernet port card comprising a synchronous digital multiplexer.
- the Ethernet port card is incorporated into a synchronous digital hierarchy multiplexer (or a SONET mulitplexer), so that as well as having a plurality of tributary interfaces for telecoms channels, for example E1, T1, E3, T3, STM-1, the multiplexer also has an interface for frame based data systems, eg Ethernet.
- SDH multiplexers operate to time division multiplex bit is oriented data.
- a plurality of lower data rate telecoms tributaries are multiplexed into a set of virtual containers operating at higher data rates.
- the SDH multiplexing structure according to ITU-T recommendation G.70X is illustrated schematically in FIG. 3 herein.
- a set of STM frames are assembled to contain a plurality of virtual containers which are carried as an STM payload as illustrated in FIG. 4 herein.
- conventional datacoms routers and equipment are frame oriented devices which operate on packets of data.
- the Ethernet port card adapts the Ethernet data frames to a rate which matches a rate which can be multiplexed into a virtual container, and maps each Ethernet data frame into one or more SDH virtual containers directly without any further encapsulation in intermediate protocols.
- a 10 MBits/s Ethernet channel may be mapped onto 5 VC12 containers, each VC12 container having a rate of 2.048 MBits/s.
- the 5 VC12 containers are concatenated together to carry the 10 MBits/s Ethernet channel.
- a single 100 MBits/s Ethernet channel may be mapped into 2 concatenated VC3 containers each having a capacity of 51.84 10 MBits/s to carry an Ethernet 1 GBits/s channel over a synchronous network, the Ethernet channel is mapped into 7 VC4 containers, each having a capacity of 139 MBits/s.
- the Ethernet port card of FIG. 2 herein comprises a conventional Ethernet physical port 201 , the Ethernet physical port communicating with an Ethernet frame switch 202 which may comprise a conventional frame switch, such as available from Plaintree, MMC, or TI; a rate adaption means 203 for adapting between Ethernet rates and SDH rates equivalent to the rates of the virtual containers; and an SDH payload mapper 204 for mapping Ethernet frames into one or more SDH payloads.
- Rate adaption means 203 and SDH payload mapper 204 may be implemented as a field programmable gate array (FPGA) or an application specific integrated circuit (ASIC).
- FPGA field programmable gate array
- ASIC application specific integrated circuit
- SDH payload mapper 204 Operation of SDH payload mapper 204 is disclosed in the applicant's co-pending U.S. patent application entitled “Payload Mapping in SDH Networks”, a copy of which is filed herewith. Data frames are mapped directly into SDH virtual containers for transport across an SDH network without adapting through any intermediate protocols.
- Rate adaption means 203 comprises a first plurality of Ethernet ports operating at 10 MBits/s; and 100 MBits/s in accordance with IEEE standard 802.3; and a second plurality of ports operating at 2 MBits/s, 50 MBits/s and 100 MBits/s communicating with SDH payload mapper 204 .
- Rate adaption means 203 comprises a plurality of through channels for adapting IEEE standard 802.3 data frames into bitstreams having data rates of 2 MBits/s, 50 MBits/s and 100 MBits/s.
- Rate adaption means 203 comprises a plurality of multiple channels each adapting an IEEE standard 802.3 rate data frame channel to a 2 MBits/s, 50 MBits/s or 100 MBits/s bitstream channel.
- Rate adaption means 203 operates effectively as a packet buffer, since Ethernet Data Frames issue from the Ethernet frame switches at a higher rate than they can be multiplexed into SDH virtual containers. Rate adaption means 203 inputs Ethernet data frames from Ethernet frame switches 202 faster than it outputs the Ethernet data frames into the SDH virtual containers. Ethernet data frames are stored in rate adaption means 203 . If the buffer stores within rate adaption means 203 become overloaded, the rate adaption means initiates flow control by sending signals back to the Ethernet frame switch to delay sending a further Ethernet frame until the buffer in the rate adaption means has sufficient capacity to accept new Ethernet data frames.
- rate adaption means 203 may be replaced by prior art commercially available POS phy chips available from PMC Sierra.
- SDH payload mapper 204 communicates with the plurality of bitstream channels of rate adaption encapsulater 203 .
- SDH payload mapper maps the plurality of bitstream channels of rate adaption means 302 into a plurality of SDH payloads, for example VC3, VC4 or VC12 thereby accessing the synchronous digital hierarchy network.
- Provision of a frame data port in a synchronous digital multiplexer enables a number of methods of interconnecting a frame data channel over a synchronous digital channel as will now be described.
- First to fifth line cards 501 - 505 each comprise a SDH payload mapper, a rate adaption means, an Ethernet frame switch and an Ethernet physical port as described hereinbefore.
- An SDH payload mapper of each card 506 - 510 respectively are connected together in a synchronous channel 511 , shown as a solid line in FIG. 5 .
- the SDH ring may comprise a VC12, VC3 or VC4 containment.
- the synchronous channel carries an Ethernet channel 512 , shown as a dotted line in FIG. 5 carrying frame based data, the Ethernet channel extending within each card through the SDH payload mapper, through the rate adaption means 513 - 517 , and into the Ethernet frame switch 518 - 522 respectively of each card.
- Ethernet switching is achieved at frame switches 518 - 522 .
- Rate adaption occurs within the Ethernet ring at Ethernet data rates, as the Ethernet data frames enter into and out of the SDH ring 511 over which they are carried. Ethernet frames are effectively carried over a carrier sense multiple access ring node (CSMA-RN), over a synchronous digital channel 511 .
- CSMA-RN carrier sense multiple access ring node
- each Ethernet port card 501 - 505 is connected via its corresponding SDH mapper to form a synchronous network.
- An Ethernet channel 600 is connected in a ring mode between the rate adaption means of each Ethernet port card 513 - 517 respectively.
- the Ethernet ring channel does not enter the Ethernet switches 518 - 522 , but is transported through the respective rate adapters 513 - 517 of the port cards. This may provide an advantage of reducing delays in the Ethernet ring by avoiding rate adaption delays, and passage through the Ethernet switches, and improve scalability of the ring. Further, fast protection of the ring under conditions of ring failure may be achieved.
- the Ethernet ring may provide a low delay, high output Ethernet communications channel.
- FIG. 7 there is illustrated schematically in logical view the ring mode connections of FIG. 6 herein.
- Data flow through the rate adaptation components provides dual ring carrier sense multiple access rings.
- FIG. 8 there is illustrated a third, backhaul, connection scheme for connection of Ethernet channels over a synchronous digital hierarchy network between a plurality of SDH multiplexers.
- Ethernet channels are carried over a physical tree of virtual container paths carried over the SDH ring 511 .
- a plurality of Ethernet channels 800 - 803 are carried over the SDH ring 511 .
- the Ethernet channels are shown schematically by their logical connections to the plurality of Ethernet ports 501 , 505 , although physically transport is over the same physical resources, within the SDH network.
- a plurality of Ethernet channels arranged in the tree arrangement are physically carried as virtual containers over an SDH ring 511 .
- ring protection may be applied to the arrangement of FIG. 8 .
- Each Ethernet channel is connected between a pair of Ethernet frame switches, and undergoes rate adaption for entry and exit to the SDH ring.
- the three modes of operation presented herein in FIGS. 5 to 8 herein, may be integrated within conventional synchronous digital hierarchy networks, using the Ethernet port cards as entry and exit ports for Ethernet channels in various combinations within an SDH network. Some examples of usage of an Ethernet channel within a synchronous network are described herein with reference to FIGS. 9 to 12 .
- voice and data services may be provided in a synchronous digital multiplexer by integrating both conventional telecoms channels, for example E1, and frame based data channels, for example Ethernet.
- a PBX 902 may communicate with a synchronous terminal multiplexer 903 in conventional manner and an Ethernet switch 904 may communicate directly with the synchronous multiplexer via, for example a 100 MBits/s link 905 to provide a private frame based data network via a central office location 906 supporting a public frame data channel signified by router 907 .
- Ethernet switch 904 may access a public data frame network via a firewall router 908 .
- FIG. 10 there is illustrated schematically how a combination of the connectivity schemes described in relation to FIGS. 5 to 8 herein may operate in a new synchronous digital hierarchy network.
- the example synchronous network of FIG. 10 comprises an STM-16 ring 1000 accessible through a plurality of add-drop multiplexers 1001 - 1004 .
- a plurality of terminal multiplexers 1005 - 1029 may be provided, one per customer premises equipment. At each customer premises equipment, access to the synchronous network is made via a corresponding Ethernet port card in the synchronous multiplexer, which is connected to a corresponding respective Ethernet router 1030 - 1043 .
- the plurality of terminal multiplexers may be connected synchronously to an intermediate multiplexer 1044 forming part of a sub-ring 1045 . Connection between the intermediate multiplexer 1044 and the plurality of tributary multiplexers 1005 - 1029 may take the backhaul form as illustrated with reference to FIG.
- a plurality of Ethernet channels are carried over a synchronous ring.
- the plurality of Ethernet channels are shown logically as radiating from intermediate multiplexer 1044 to the plurality of terminal multiplexers 1005 - 1029 .
- the tandem switching mode, or the ring mode as described with reference to FIGS. 5 to 8 herein may operate.
- FIG. 11 there is illustrated schematically a second network layout incorporating a plurality of Ethernet frame based data channels transported across an underlying synchronous digital hierarchy network.
- An STM-64 synchronous ring 1100 links a plurality of add-drop multiplexers 1101 - 1105 in a synchronous loop.
- Various Ethernet frame be transported over the underlying synchronous network as follows.
- a further Ethernet channel between first Ethernet router 1106 and second Ethernet router 1107 is carried over STM-64 ring 1100 between first and second add-drop multiplexers 1101 , 1105 , each of which are equipped with an Ethernet port as described hereinbefore.
- a second Ethernet channel between first Ethernet router 1106 and third Ethernet router 1108 of 1 Gbit/s is carried between a terminal multiplexer 1109 equipped with an Ethernet port as described hereinbefore, and an add-drop multiplexer 1104 , for access to the STM-64 ring 1100 .
- an equipment cost saving may achieved, because there is no need for adaption of Ethernet data into a telecoms interface, eg E1 or T1.
- port consolidation may be achieved. Instead of having a large number of ports at a head end, as in prior art systems, one frame based data port per multiplexer may be provided. A saving on equipment and wiring may be achieved.
- channel capacity may be achieved in the synchronous network, through application of statistical gain between the frame based data rate channels and the synchronous data rate channels. For example, since frame based data channels are not always fully utilized, a plurality of frame based data rate channels may be multiplexed onto a synchronous rate channel of a same or similar data rate. For example, four 10 MBits/s data frame rate channels may be multiplexed onto a single 10 MBits/s synchronous rate channel, since the total traffic received from the four frame based data rate channels, which are not all fully utilized at the same time, may be statistically multiplexed onto a single 10 MBits/s synchronous data rate channel.
- Table 1 herein illustrates a comparison of Ethernet data rates (in a central column of Table 1) with telecoms interface rates (in the left hand column of FIG. 1 ), and SDH virtual container rates (in the right hand column of Table 1).
- a 10MBits/s Ethernet data rate can be accommodated neatly into 5 VC12 containers, each of 2 MBits/s.
- a 100 MBits/s Ethernet data rate can be accommodated in 2 VC3 containers, each of 50 MBits/s.
- Prior art telecoms interfaces which can be purchased for carrying frame based data over a wide area network operate a 2 MBits/s (E1), 34 MBits/s (E3), 155 MBits/s (STM-1) or 622 MBits/s (STM4). These data rates are not well matched to the prior art Ethernet data rates of 10 MBits/s, 100 MBits/s and 1 GBits/s.
- the prior art Ethernet data rates are well matched to multiples of the synchronous digital hierarchy virtual container payload data rates, as illustrated in Table 1.
- the SDH payload data rates have a granularity of a minimum incremental step of 2 MBits/s.
- a minimum granularity of Ethernet rates is 10 MBits/s, and so 5 SDH VC12 containers can accommodate neatly a single 10 MBits/s Ethernet channel.
- a further feature of the specific embodiments and methods described herein is the provision of quality of service.
- the Ethernet IEEE 802.1 P/Q priority field By using the Ethernet IEEE 802.1 P/Q priority field, different packets can be given different priorities for transmission.
- quality of service levels which are achievable in prior art local area networks, may be extended over greater geographical distances carried over a synchronous digital hierarchy transport network as provided by the specific embodiments and methods of the present invention.
Abstract
Description
TABLE 1 | ||
Telecoms | Ethernet | Synchronous Network |
E1 | (2 Mbits/s) | 10 | MBits/s | 1-5xVC12 |
(2 MBits/s-10 MBits/s) | ||||
T1 | (1.5 Mbits/s) | 10 | MBits/s | 1-8xVT 1.5 |
(2 MBits/s-10 MBits/s) | ||||
E3 | (34 MBits/s) | 100 | MBits/s | 1-2xVC3 |
(50 MBits/s-100 MBits/s) | ||||
T3 | (45 MBits/s) | 100 | MBits/s | 1-2xSTS-1 |
(50 MBits/s-100 MBits/s) | ||||
STM-1 | (155 MBits/s) | 100 | MBits/s | 1-2xVC3 |
(50 MBits/s-100 MBits/s) | ||||
OC-3 | (155 MBits/s) | 100 | MBits/s | 1-2xSTS-1 |
(50 MBits/s-100 MBits/s) | ||||
STM-4 | (622 MBits/s) | 1 | GBits/s | VC4-Nc |
(155 MBits/s-1.2 GBits/s) | ||||
N = 1-8 | ||||
OC-12 | (622 MBits/s) | 1 | GBits/s | STS-Nc |
(155 MBits/s-1.2 Gbits/s) | ||||
N = 3, 6, 9, 12, 15, 18, 21, 24 | ||||
Claims (24)
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/143,466 US6496519B1 (en) | 1998-08-27 | 1998-08-27 | Frame based data transmission over synchronous digital hierarchy network |
DE69925548T DE69925548T2 (en) | 1998-08-27 | 1999-06-22 | Transmission of frame-based data over a synchronous hierarchical digital network |
EP99304876A EP0982900B1 (en) | 1998-08-27 | 1999-06-22 | Transmission of frame based data over a synchronous digital hierarchy network |
CA002276958A CA2276958A1 (en) | 1998-08-27 | 1999-07-07 | Frame based data transmission over synchronous digital hierarchy network |
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Also Published As
Publication number | Publication date |
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DE69925548T2 (en) | 2005-10-27 |
DE69925548D1 (en) | 2005-07-07 |
EP0982900A3 (en) | 2002-01-30 |
EP0982900A2 (en) | 2000-03-01 |
US20030021294A1 (en) | 2003-01-30 |
CA2276958A1 (en) | 2000-02-27 |
US6816496B2 (en) | 2004-11-09 |
EP0982900B1 (en) | 2005-06-01 |
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